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  • Status: Solved
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Lync unable to connect to Server

User  is getting an error message every time he tries to login to Lync.
This is error user getting User is getting Message that :- Cannot sign in because server is temporarily unavailable.
If the problem continues , Please contact your support team.
1 Solution
is the user in the right pool? Is this in the office or from a remote location?
UDSquareAuthor Commented:
User is placed at right pool. And user is in same office.
Couple of quick points,

Hope your Lync Server has a cert installed on it

Go to Options -> Personal -> Advanced and provide the Lync Pool FQDN and try

Go to Options -> Personal -> Advanced and provide the Lync Pool IP Address and try

Go to C:\Users\user\AppData\Local\Microsoft\Communicator\sip_address and delete the profile

check if DNS is working fine w.r.t SIP lookups - Open command prompt type - nslookup - hit enter - type set type=all - hit enter - type _sip._tls.yourdomain.com - hit enter - check the results.

Worst, case scenario we'll enable logging and view the results of it to understand where it failed.


I've seen this error happen if the user is not typing in the correct SIP sign-in address as opposed to their email address, which should be what has been provisioned on the Lync server.

Can you confirm that you can login to this persons account correctly? As per the Lync backend configuration and testing their credentials against OWA to be 100% sure.

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